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| 型號： | E110 |
| 英文描述： | Test Methods for 10Base-T Modules |
| 中文描述： | 試驗(yàn)方法10Base - T的模塊 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 56K |
| 代理商： | E110 |
HP3577A
NETWORK
ANALYZER
OR EQUIVALENT
LPF
XFMR
CMI
1
2
3
4
5
6
7
14
13
12
11
10
9
8
50
S1
50
S2
*R1
*R2
*R3
*R4
* 50
± 0.1%
R1=R2=R3=R4
XFMR
CMI
LPF
TEST METHODS FOR PULSE
10BASE-T MODULES
Application Note
E110.A (5/97)
For More Information :
Corporate
12220 World Trade Drive
San Diego, CA 92128
Tel:
619 674 8100
FAX: 619 674 8262
http://www.pulseeng.com
Quick-Facts: 619 674 9672
Europe
Millpool House
Mill Lane, Godalming
Surrey GU7 1EY
U.K.
Tel:
441 483 428 877
FAX: 441 483 416 011
Asia
P.O. Box 26-11, KEPZ
6 Central Sixth Road
KEPZ, Kaohsiung
Taiwan, R.O.C.
Tel: 886 7 821 3141
FAX: 886 7 841 9707
Distributor
Common Mode Rejection
The Common to Common test circuit, in Figure 4 below, is the method used to measure Common
Mode Rejection. This parameter is especially important in meeting FCC/VDE emission testing.
Common mode currents on the transmission cable are a major source of EMI emissions.
To perform the Common Mode Rejection test:
1. The equipment is first calibrated with a direct connection to a 50
cable between the input
and output of the waveform analyzer. Conduct a thru calibration.
2. The test fixture is then connected between the input and the output. Insert the device under
test in the fixture.
3. The signal is then input into pins 4, 5, 6, and 7 which are shorted. Measure the output unbal-
ance through R3 and R4. These resistors shoud be matched to within ±0.1%.
4. The test is repeated with pins 1, 2, and 3 shorted and connected to the input. The output
imbalance is measured through R1 and R2 which are also matched to ±0.1%.
Figure 4
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
Printed on recycled paper. 1997, Pulse Engineering, Inc.
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